Automatic air control for furnaces



0. H.-HERTEL.'

AUTOMATIC AIR CONTROL- FOR FURNACES. APPLICATION rim) FEB. 1, 1918.

1 58,204; Patented Nov. 9, 1920.

2 SHEETS-SHEET l l T a 0. H. HERTEL.

AUTOMATIG MR CONTROL FOR FURNACES.

APPLICATION FILED FEB. 1. 1918.

1 ,358, 204, Patented Nov. 9, 1920'.

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UNITED srArrs rarest OFFICE.

OTTO I-I. HERTEL, OF GLENELLYN, ILLINOIS, ASSIGNOB, IEY IMESNE ASSIGNMENTS, TO KREHBIEL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

AUTOMATIC AIR conTnoL non. FURNACES.

Patented Nov. 9, 1920.

Application filed February 1, 1918. Serial No. 214,813.

To (ZZZ whom it may concern:

Be it known that I, OTTO H. HERTEL, a citizen of the United States, and a resident of Glenellyn, in the county of Dupage and State of Illinois, have invented certain new and useful Improvements in Automatic Air Control for Furnaces, of which the following is a specification.

My invention relates to improved automatic air controlling mechanism for 'furnaces. I

In my co-pending application Serial No. 203,231, filed November 21, 1917, I disclose a two-zone furnace comprising a zone for'receiving and coking coal and another zone for receiving the coke from the coking zone'and burning it, and separate ash pits for the grate sections of the zones together with air inlets to the pits. The object of my present invention is to provide automatically operated mechanism for controlling the supply of air into the ash pits and to the respective grates of the zones.

0n the accompanying drawings Figure 1 is a side elevational view, partly in section, showing one form of furnace to which my invention is applied. I

Fig. 2 is an enlarged sectional view on plane 22, Fig. 1,

Fig. 3 is a perspective view of the air controlling mechanism for the coke burning zone, and

Fig. 4 is a fragmentary view showing another position of the parts shown in Fig. 2.

In the furnace shown the combustion chamber is divided by a transversely extending wall or arch 12 into a forward coking zone and a rearward combustion zone 11, said arch terminating a short distance above the grate 13 and forming a passage way 14: for the passage of the coke from the coking zone to the combustion zone. Below the zone 10 is the ash pit 15 and below the zone 11 is the ash pit 16, these ash pits being separated by the wall 17. The ordinary form of door 18 is provided for the ash removing opening 19 of the pit 15, the door having the air passageway 20 to be con trolled by the damper 21 pivoted to swing vertically.

A rectangular frame 22 is secured to one side of the pit 16 around a suitable opening therethrough and has hinged thereon the door 23 for controlling such opening for the removal of ashes. The door has the rectangular opening 24: which is controlled The dimensions are such that when the damper is swung to one extreme position it will close the air passageway by engaging against the inner and outer edges respec tively of the walls 30 and 31 and against the inner edges 01"" the side wall sections 32 and 34; and the outer edges of the side wall sections 33 and 35, as shown in full lines Fig 2. When the damper is in its other extreme position, as shown in dotted linesFig. 2, it will engage with the opposite edges of these walls to completely close the air passageway. I

Extending laterally from the corner of the damper is a pin 36, and pivoted at its inner end to theside wall 35 is the operating lever 37 which has the longitudinally extending slot 38 for receiving the pin. The inner end of the longitudinal slot communicates with the upper end of the transverse slot 39 in tudinal slot and the lever is swungvertically the damper will be rotated to control the air passageway, and the location oi the transverse slot 39 is such that when the lever is swung downwardly sufficiently to entirely the lever. hen the pin is within the longiand modifications are no doubt possible which. would still come within the scope of the invention. I

I claim as follows:

1. In a furnace, the combination of two combustion zones, a separate ash pit for each zone, an air inlet for each ash pit, a damper hinged at one end to control the air inlet for one of said ash pits, a damper trunnioned within the inlet for the other ash pit to be swung to extreme positions to close said inlet or to intermediate positions to open said inlet, a pin extending from said trunnioned damper, a lever pivoted ad jacent said trunnioned damper and having a slot for receiving said pin whereby said damper is rotated when the lever is swung, said lever having a transverse slot at the end of the longitudinal slot, said transverse slot receiving the pin when said trunnioned damper is in one position of closure whereby said lever may then be raised independently of said damper, a prop for normally holding said trunnioned damper partially open to shift the pin out of the transverse slot and into the longitudinal slot, and means automatically controlled in accordance with the heat generated by the furnace and connected with said lever and said first mentioned damper to automatically control the opening and closure of said dampers.

2. n a furnace, the combination of two zones in which fuel may be burned, grate surface below each zone, an ash pit below each zone, each pit having an air inlet, chimney draft normally effective on both zones, damper mechanism normally controlling both air inlets in accordance with the combined heat delivered by said zones, and means for closing one inlet and opening the other when the fire in one zone dies out whereby the chimney draft will be then concentrated on the other zone.

3. In a furnace, the combination of a coking zone and a burning zone in which the coke formed in the coking zone is received and bur ed, chimney draft normally effective on both zones, and means controlled by the heat delivered by said furnace for concentrating the chimney draft on the coking zone when the fire in the burning zone dies down.

4. In a furnace, the combination of a coking zone and a burning zone for receiving and burning the coke formed in the coking zone, chimney draft connected with said zones, an air inlet for each zone, and means controlled by the heat delivered by said zones for automatically closing the air in let for the burning zone to thereby concentrate the chimney draft on the coking zone which zone then becomes the burning zone.

5. In a furnace, the combination of a coking zone and a coke burning zone, there beinga passageway between said zones for the shifting of coke from the coke forming zone to the coke burning zone, an outlet from said coke burning zone to a chimney,

independent air inlets for each zone, means automatically controlled by the heat delivered by said zones for normally opening and closing said air inlets in accordance with the heat delivered whereby both zones are subject to the chimney draft, said air inlet controlling means causing closure of the air inlet for the burning zone when the fire in said zone dies down, whereby the chimney draft is then concentrated on the coking zone and said zone becomes the burning zone.

6. In a furnace, the combination of two zones, chimney draft connected with said zones, independent air inlets for said zones, damper mechanism for each inlet, means automatically controlled by the heat delivered by said zones for controlling the operation of said dampers, said damper controlling mechanism operating when the fire in one zone becomes low to close the inlet damper for said zone and to disconnect it from said damper whereby the chimney draft is then concentrated on the other zone and the inlet damper. for said other zone controlled by said damper controlling mechanism.

7. In a furnace, the combination of two zones, independent air inlets for said zones below the grate thereof, chimney draft connected with both zones, damper mechanism for each air inlet, thermostat mechanism normally connected with both damper mechanisms to control the opening and closure thereof in accordance with the heat delivered by said zones, and means for automatically disconnecting the damper mechanism of one zone from said thermostat mechanism when the fire in said zone dies down. 8. In a furnace, the combination of a coking zone and a coke burning zone, there being a passageway between said zones for the transfer of coke from the coking zone to the coke burning zone, and means automatically controlled by the heat delivered by said zones for closing the draft for the coke burning zone and increasing the draft on the coking zone when the supply of coke in said coke burning zone is exhausted.

9. In a furnace, the combination of two zones, draft producing means, means for normally connecting said draft producing means with both zones, and means for disconnecting said draft producing means from one zone when the fuel in said zone is exhausted and to concentrate the draft on said other zone.

10. In a furnace, the combination of a coking zone and a coke burning zone, independent air inlets for said zones below the grate surfaces thereof, damper mechanism let damper mechanism from said thermo- 10 for each air inlet, thermostat mechanism stat mechanism When said damper mechaconnected With said damper mechanism and nism has been closed and the damper mech controlled by the heat delivered by said anism for the coking zone fully opened. zones,rsai'd thermostat mechanismantomati- In Witness whereof, I hereunto subscribe cally controlling the degree of opening or my name this 26th day of January, A. D. 15 closure of said damper mechanism during 1918.

normal operation of the furnace, and means for disconnecting the coke burning zone in OTTO H. HERTEL. 

